B.G 2.23
नैनं छिन्दन्ति शस्त्राणि नैनं दहति पावकः। न चैनं क्लेदयन्त्यापो न शोषयति मारुतः ॥ २-२३॥
Weapons cannot cut Him, fire cannot burn Him, water cannot drench Him, not even wind can dry Him.
Gīta Bhāshya 2.23
Both natural causes and particular special causes cannot affect the Lord.
स्वतः प्रायोनिमित्तैश्च अविनाशिनोऽपि केनचिन्निमित्त विशेषेण स्यात्। ककच्छेदवत् इत्यतो विशेषनिमित्तानि निषेधति– 'नैनम्' इति ॥ २३ ॥
Though indestructible by itself and not affected by natural causes, can it be affected by specific causes? The idea of specific causes is negated in the verse 'nainam', i.e. not this, by giving examples like cutting with a saw, etc.
Gīta Tātparya 2.23
Various external causes cannot destroy or alter the Lord.
कारणतोपि न ईश्वरस्य अन्यथात्वमित्याह - नैनं छिन्दन्तीति ॥२३॥
Even from the standpoint of (external) cause, there is no change in the Supreme Being; thus it is said - 'nainam chindanti', i.e. not possible to pierce, and so on.